Eldritch Horror: The Mountains of Madness The first side board expansion for Eldritch Horror, inspired by H.P; Lovecraft's classic novella The side board and over 150 encounter cards allow players to experience locations throughout Antarctica Eight investigators contribute their unique talents to the fight to save humanity Two new Ancient Ones, the Elder Things and Ithaqua, threaten unspeakable destruction Numerous new Assets, Conditions, Gates, and Monsters spread horror across the globe